Trevin Wax: Your title is provocative. Becoming Worldly Saints is the last thing we want for people, unless we recognize the proper sense of “worldly” versus the improper sense. Can you explain why your title is a good summary for the main point of your book?

Mike Wittmer: The Puritans were called “Worldly Saints” in Leland Ryken’s book by that name, so it may not be as provocative as it sounds. It might just be old-fashioned!

“Worldly Saints” may seem like an oxymoron, but it’s the perfect title for what God calls Christians to be. We must be worldly—enjoying creation, loving friends and family, and excelling in our cultural tasks. All things being equal, Christians should make the best humans. We also must be saints—loving God, fighting sin and…

Most American evangelicals hold views condemned as heretical by some of the most important councils of the early church.

A survey released today by LifeWay Research for Ligonier Ministries “reveals a significant level of theological confusion,” said Stephen Nichols, Ligonier’s chief academic officer. Many evangelicals do not have orthodox views about either God or humans, especially on questions of salvation and the Holy Spirit, he said.

On October 31, 1517—a Saturday—a 33-year-old former monk turned theology professor at the University of Wittenberg walked over to the Castle Church in Wittenberg and nailed a paper of 95 theses to the door, hoping to spark an academic discussion, making the first order of business the proposition that all of life…